[ios] Skip test if device is not running in US locale

Test TranslateInfobarModalOverlayMediatorTest.UpdateLanguageInfo
fails if system locale is not "en-US". This prevents running the
test on a developer device if they want to use the device in their
language.

Bug: 1102968
Change-Id: Icdc61da3c1015388c89a8ecc90aeb45e5e93a88d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2421457
Commit-Queue: Sylvain Defresne <sdefresne@chromium.org>
Commit-Queue: Olivier Robin <olivierrobin@chromium.org>
Auto-Submit: Sylvain Defresne <sdefresne@chromium.org>
Reviewed-by: Olivier Robin <olivierrobin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#808877}

ios/chrome/browser/ui/overlays/infobar_modal/translate/translate_infobar_modal_overlay_mediator_unittest.mm

@@ -121,6 +121,14 @@ TEST_F(TranslateInfobarModalOverlayMediatorTest, ShowOriginalLanguage) {
 // called, and didSelectSourceLanguageIndex and didSelectTargetLanguageIndex
 // were called beforehand to change the source and target languages.
 TEST_F(TranslateInfobarModalOverlayMediatorTest, UpdateLanguageInfo) {
+  // The order of the languages depends on the locale the device is running.
+  // Skip the test if the locale is no en-US where the indexes have been
+  // computed.
+  NSString* currentLanguage =
+      [[[NSBundle mainBundle] preferredLocalizations] firstObject];
+  if (![currentLanguage isEqual:@"en-US"])
+    return;
+
   // Language indexes are different on iOS 14.
   // TODO(crbug.com/1102968): Avoid hard-coding indexes here.
   const int portuguese_index = base::ios::IsRunningOnIOS14OrLater() ? 67 : 69;